Inforshare 2020

1. Noopur Gupta
Eclipse JDT co-lead
IBM | ACM FCA
@noopur2507
@EclipseJavaIDE
@infosharepl
Java tooling, Tips & Tricks!
Mastering your IDE

2. OVERVIEW
Appearance
Navigation
Investigation
Coding
Debugging
Java Tooling
JUnit 5 Tooling

3. • Window > Appearance
• Hide Toolbar, Status Bar
• Full Screen
• Show key bindings when command is invoked
• Zoom in Text Editors
• Zoom In: Ctrl +
• Zoom Out: Ctrl -
• Pinch gestures on touch-enabled devices
• Working Sets
• Preferences > Java > Appearance
• Abbreviate Package Names with Custom Rules
• Sort Library Entries Alphabetically in Package Explorer
APPEARANCE

4. • Quick Access / Find Actions (Ctrl + 3)
• Quick Switch Editor (Ctrl + E) – Open editors list
• ‘Delete’ – close editor
• Quick Outline (Ctrl + O, twice to show inherited members)
• In-place Outline (Ctrl + F3)
• Configure problem severity quick fix (Ctrl + 1)
• Hovers (Preferences > Java > Editor > Hovers)
• In-place Javadoc (with error/warning on element)
• Ctrl + Shift and hover, or use Javadoc view
• In-place source code
• Shift and hover, or use Declaration view
• Sticky Hover (F2) – Open attached Javadoc in a Browser
• Expand vertical ruler icons upon hovering
NAVIGATION

5. • Search Dialog
• Quick Search Dialog
• Go to last edit location (Ctrl + Q)
• Ctrl + Alt + Left/Right to move to multiple previous/next edit locations
• Alt + Left/Right to move backward/forward in editor navigation history
• Markers
• Bookmarks
• Right-click on left editor pane > Add Bookmark…
• Bookmarks view
• Tasks
• Right-click on left editor pane > Add Task…
• Tasks view
• Preferences > Java > Compiler > Task Tags
• Show In (Alt + Shift + W) > System Explorer
NAVIGATION

6. • Plug-in Spies
• Plug-in Selection Spy - Alt/Option + Shift + F1
• Plug-in Menu Spy - Alt/Option + Shift + F2
• Show Contributing Plug-in - Alt/Option + Shift + F3
• Layout Spy - Ctrl + Alt + Shift + F9
• Plug-in Image Browser
• Externalized Strings
• Ctrl + Click on key in .properties file to find referencing code
• Show Revision Information
• To determine who last modified a line of code and when
• Right-click on left editor pane > Show Revision Information
INVESTIGATION

7. • UI Responsiveness Monitoring
• For automatic detection and logging of stack traces when Eclipse UI
is unresponsive
• Window > Preferences > General > UI Responsiveness Monitoring
• Java Stack Trace Console
• Copy stack trace from log file and Navigate > Open from Clipboard
(Ctrl + Shift + V)
• Click on hyperlinks to jump to the code
• Click on exception name hyperlink to create an exception breakpoint
INVESTIGATION

8. • Content Assist - Insert or Overwrite
• Replace existing text while invoking content assist
• Press ‘Ctrl’ to toggle while content assist is active
• Content Assist Templates
• Configure/Create in Templates view, Export/Import in Preferences
• Content Assist Postfix Proposals
• Preferences > Java > Editor > Content Assist > Advanced
• Auto Activation of Content Assist
• Auto activation triggers for Java
• Disable insertion triggers except ‘Enter’
• Preferences > Java > Editor > Content Assist
• Type Filters
• Ignore certain types from content assist, imports organization, quick fixes,
open type dialog etc.
• Preferences > Java > Appearance > Type Filters
CODING

9. • Code Minings (as decorative text; via extension point)
• Preferences > Java > Editor > Code Minings
• Show references
• Show implementations
• Show method parameter names
or, Show method parameter hints – Ctrl + Shift + Space
• Block Selection Mode (Alt + Shift + A)
• To edit a large number of almost identical lines at the same time
• Expand selection to enclosing element (Alt + Shift + Up / Down)
• Duplicate lines (Ctrl + Alt + Up / Down)
• Move lines (Alt + Up / Down)
• Delete lines (Ctrl + D)
CODING

10. • Smart Step Into (Ctrl + Alt + Click)
• To step into a single method within a series of chained or nested method calls
• Step Filters
• To filter out specified classes and packages while stepping into code
• Preferences > Java > Debug > Step Filtering
• Run to Line (Ctrl + Alt + Click on left editor pane)
• Grouping and Sharing breakpoints – Breakpoints view
• Sort by name or creation time
• Group by various categories or create working sets
• Share by exporting/importing breakpoint groups
DEBUGGING

11. • Tracepoint
• A point in code where the debugger does not break the execution but
only prints to console
• Prevents the addition of print statements in code while debugging
• Can be used to debug race conditions or to see the order of execution of
threads
• Run > Toggle Tracepoint
• Trigger Point
• Set a breakpoint as trigger point in Breakpoint Properties
• All the breakpoints (except trigger points) are disabled until a trigger
point is hit
• All the trigger points are disabled after a trigger point is hit and all the
trigger points will be re-enabled for the next run
• Remove all trigger points – context-menu action in Breakpoints view
• Hit count - The breakpoint suspends the execution of a thread only when it
is encountered for the Nth time.
DEBUGGING

12. • Paste Code on Package Explorer
• A new Java project will be created and the file will be opened in Java
editor
• Right-click on Project > Configure > Enable preview features
• Project Properties > Java Compiler > Preview features with severity level
• Sealed Classes
• New > Java > Record
• Pattern matching for instanceof
• Text blocks
• Ctrl + Shift + ' to insert triple quotes
• Double-click to select text block content
JAVA TOOLING

13. • Switch Expressions and Enhanced Switch Statements
• Add missing case statements and default case
• Split case labels
• Ctrl + Click on ‘case’ and ‘default’ to jump to the target location
in switch
• ‘var’ support
• Declare extracted local variable’s type as ‘var’
• Replace ‘var’ with inferred type & vice-versa
• Hover to view the inferred type for ‘var’
• Ctrl + Click to navigate to the inferred type of ‘var’
JAVA TOOLING

14. • Java Platform Module System
• Convert to modular project - create module-info.java action
• Add libraries to module path
• Configure properties of module graph (Module Dependencies)
• Quick fix to identify and add required module to module-info.java
• Create and export a non-empty package from module-info.java
• Quick fix to provide a service implementation from module-info.java
• Lambda Expressions and Method References
• Convert anonymous class to lambda and back
• Convert lambda to method reference and back
• Add inferred lambda parameter types
• View and navigate to the functional method
• Refactoring on functional interface instances e.g. Change method signature
JAVA TOOLING

15. • Quick assist to create JUnit Jupiter test class and test method
• Grouped assertions and combined result comparison
• Navigate to failing source location
• Double-click on entry in JUnit view’s failure trace
• Click "Show Stack Trace in Console View" button and use the
hyperlinks
• Tagging and Filtering (@Tag)
• Configure Tags dialog in JUnit launch configuration
• Embracing JUnit 5 with Eclipse IDE – Webinar - vECM
JUnit 5 TOOLING

16. • List all keyboard shortcuts (Ctrl + Shift + L)
• Configure keyboard shortcuts (Ctrl + Shift + L - twice): Preferences > General > Keys
• Eclipse Help > Tips and Tricks…
• Eclipse Help > Welcome > What’s new
• New and Noteworthy: https://www.eclipse.org/eclipse/news/4.x
• Twitter
• @EclipseJavaIDE
• #EclipseTips
RESOURCES

17. Thank
You!
@noopur2507
@EclipseJavaIDE
@infosharepl